4

463

Acvatix™

3-port seat valves, external thread, PN 16

 Bronze CuSn5Zn5Pb2 valve body

VXG41..

 k vs

1.6…40 m

3

/h

 Flat sealing connections with external thread G…B to ISO 228-1

 Sets of ALG..3 threaded fittings with threaded connection available from Siemens

 Can be equipped with SAX.. electromotoric or SKD.. and SKB.. electrohydraulic actuators

 VXG41..01 3-port seat valves are DVGW tested

Use

For use in heating, ventilating and air conditioning systems as a control valve for mixing and diverting functions. For closed and open circuits (mind

« cavitation

»

on page 5).

VXG41..01 Three-port seat valves for distribution or supply of cold water to storage or heat exchanger for hot water treatment in the drinking water installation.

CE1N4463en

15.11.2010

Building Technologies

Type summary

Accessories

Order

Delivery

Example:

Spare parts, rev. no.

Type / stock no. DN

15

k vs

[m

3

/h]

S v

1,6

2,5

> 50

4,0

20 6,3

25 10

40 25

50 40

1)

These types, as a standard, are equipped with a tight bypass. DVGW verified, DVGW applications according to drinking water regulation 2001. For medium temperatures up to 90 °C

DN = Nominal size k vs

= Nominal flow rate of cold water (5...30 °C) through the fully open valve (H

100

) by a differential pressure of 100 kPa (1 bar)

S v k vr

= Rangeability k vs

/ k vr

= Smallest k v

value, at which the flow characteristic tolerances can still be maintained, by a differential pressure of 100 kPa (1 bar)

Type Stock No.

ALG..3

1)

ALG..3

Description

Set of 3 threaded fittings for 3-port valves, consisting of

ALG..3B

1)

S55846-Z1..

- 3 union nuts, 3 discs and 3 flat seals

ALG..3B are brass fittings, for media temperatures up to 100 °C.

ASZ6.5 ASZ6.5 Electric stem heating element, AC 24 V / 30 W, required for media below 0 °C. For electrohydraulic actuators SKD.., SKB.. below 0 °C

1)

Applications requiring union fittings with DVGW approval must be delivered by thirds.

When ordering please give type, stock no., designation and quantity.

Type Stock no. Designation

VXG41.2501 VXG41.2501 Valve

ALG253B S55846-Z105 Set of threaded fittings

Valves, actuators and accessories are packed and supplied separately.

See overview, page 10.

Quantity

2

2

2/10

Siemens

Building Technologies

3-port seat valves, external thread, PN 16 CE1N4463en

15.11.2010

Equipment combinations

Valves

VXG41.1301

3)

VXG41.1401

3)

VXG41.15 VXG41.1501

VXG41.20 VXG41.2001

VXG41.25 VXG41.2501

VXG41.32 VXG41.3201

VXG41.40 VXG41.4001

VXG41.50 VXG41.5001

SAX..

1)

Actuators

SKD..

1)

SKB..

Mixing Diverting Mixing Diverting Mixing Diverting

p max

Type / stock no.

Fitting sets

Malleable cast iron

Type Stock no.

Brass

800 200

800

2)

ALG203 ALG203B

Actuator overview

Note:

100

2)

1)

Usable up to maximum medium temperature of 150 °C

2)

If noise is permitted, the same values apply as for the mixing valve.

3)

Use the valves in conjunction with actuators SKD.. or SKB.. to ensure compliance with the bypass leakage rate.

p max

= Maximum permissible differential pressure across valve’s control path, valid for the entire actuating range of the motorized valve

Type Actuator type

Operating voltage

Positioning signal

Spring return

Positioning time

Positioning force

Data sheet

SAX31.00

SAX31.03

SAX81.00

SAX81.03

Electromotoric

AC 230 V

AC/DC 24 V

3-position

No

120 s

30 s

120 s 800 N

DC 0…10 V

1)

30 s

SAX61.03

SKD32.50

SKD32.21

SKD32.51

SKD82.50

AC 230 V

30 s

Electrohydraulic

3- position

Yes

No 120 s 1000 N

SKD82.51

SKD60

AC 24 V

Yes

No

DC 0…10 V

1)

30 s

SKD62..

Yes

SKB32.50

No

AC 230 V

SKB32.51

Yes

3- position

SKB82.50

ElectroNo

120 s 2800 N

SKB82.51

hydraulic Yes

AC 24 V

SKB60

DC 0…10 V

1)

No

SKB62..

Yes

Actuators SAX81.. and SAX61.. are UL listed

1)

or DC 4…20 mA or 0…1000 Ω

Pneumatic actuators are available on request from your local office or branch.

Application is possible only if the VXG41.. is used as a mixing valve.

N4501

N4563

N4564

Siemens

Building Technologies

3-port seat valves, external thread, PN 16

3/10

CE1N4463en

15.11.2010

Technical design / mechanical design

Valve cross section

A

B

AB

A

B

AB

Guided perforated plug which is integrated in the valve stem.

A pressed-in stainless steel seat ring is used as seat A – AB.

Sizing

Flow diagram

«Mixing»

DN

- k vs

50 -

40

40 -

25

32 -

16

25 -

10

20 -

6,3

15 -

4

15 -

2,5

15 -

1,6

p max

= Maximum permissible differential pressure across the valve (mixing: port A - AB, B - AB), valid for the entire actuating range of the motorized valve

p v100

= Differential pressure across the fully open valve and the valve’s control path

A – AB, B - AB by a volume flow V

100

V

100

= Volume flow through the fully open valve (H

100

)

100 kPa = 1 bar

 10 mWC

1 m

3

/h = 0.278 l/s water at 20 °C

4/10

Siemens

Building Technologies

3-port seat valves, external thread, PN 16 CE1N4463en

15.11.2010

Valve flow characteristic

Cavitation

Note on chilled water

High temperature hot water example:

1

0.8

B -

A

B

0.6

0.4

A

B

AB

0.2

A -

AB

0

0 0.2 0.4

0.6

0.8

Stroke H / H

100

1

Throughport

0 ...30 %: linear

30 ...100 %: equal-percentage n gl

= 3 to VDI / VDE 2173

Bypass

0...100 %: linear

Mixing:

flow from port A and port B to port AB

Diverting: flow from port AB to port A

and port B

Port I = constant flow

Port II = variable flow

Port III = bypass (variable flow)

Use the 3-port valve primarily as a mixing valve.

Cavitation accelerates wear on the valve plug and seat, and also results in undesirable noise. Cavitation can be avoided by not exceeding the differential pressure shown in

the flow diagram on page 4, and by adhering to the static pressures shown below.

To avoid cavitation in chilled water circuits ensure sufficient counter pressure at valve outlet, e.g. by a throttling valve after the heat exchanger. Select the pressure drop across the valve at maximum according to the 80 °C curve in the flow diagram below.

2500

25

Mixing



p max

2000 20

p

1 p

3

1500



18

0

° C

16

0

°C

14

0

°C

12

0

10

0

°C

°C

80

°C

15

p

2



p max'

M

1000 10

M

Diverting



p max p

1 p

3

500

5



p max' p

2

0

0

0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300

p

max

[kPa]

p max

= Differential pressure with valve almost closed, at which cavitation can largely be avoided

Situation bypass p

1

= Static pressure at inlet p

2

= Static pressure at outlet

M = Pump

Pressure p

1

at valve inlet: 500 kPa (5 bar)

Water temperature: 120 °C

From the diagram above, it will be seen that with the valve almost closed, the maximum permissible differential pressure

p max

is 200 kPa (2 bar).

Siemens

Building Technologies

3-port seat valves, external thread, PN 16

5/10

CE1N4463en

15.11.2010

Working pressure and temperature

16

15

14

13

12

1

0

- 60 -40

-25

0 20 80 100 120

150

180

Working temperature [°C]

Working pressure and medium temperature staged as per ISO 7005

Current local legislation must be observed.

Notes

Engineering

Mounting

Orientation

In open circuits, there is a risk of valve plug seizing caused by scale deposits. Thus, use only the most powerful actuator SKB.. for these applications. Additionally, periodic actuation (twice or three times per week) must be planned.

With closed and open circuits always use a strainer upstream of the valve to increase the valve's functional safety.

Ensure cavitation-free flow, refer to page 5.

To ensure the reliability of the valve, we recommend the fitting of a strainer at the valve inlet in closed and open circuits.

For media below 0 °C, use the electric stem heating element to prevent the valve stem from freezing in the sealing gland. For safety reasons, the stem heating element has been designed for AC 24 V / 30 W operating voltage.

Both valve and actuator can easily be assembled at the mounting location. Neither special tools nor adjustments are required.

The valve is supplied with Mounting Instructions 4 319 9563 0.

90° 90°

Direction of flow

Commissioning

When mounting, pay attention to the valve's flow direction symbol

:

Mixing from

A / B to AB

A AB

Diverting from

AB to A / B

AB A

B B

Commission the valve only if the actuator has been mounted correctly.

Valve stem retracts: Throughport A – AB opens, bypass B closes

Valve stem extends: Throughport A – AB closes, bypass B opens

6/10

Siemens

Building Technologies

3-port seat valves, external thread, PN 16 CE1N4463en

15.11.2010

Maintenance

Disposal

Warning

Stem sealing gland

VXG41.. valves require no maintenance.

When doing service work on the valve / actuator:

 Deactivate the pump and turn off the power supply

 Close the shutoff valves

 Fully reduce the pressure in the piping system and allow pipes to completely cool down

If necessary, disconnect the electrical wires.

Before putting the valve into operation again, make certain the actuator is correctly fitted.

The glands can be exchanged without removing the valve, provided the pipes are depressurized and cooled off and the stem surface is unharmed, refer to «spare parts»,

page 10.

If the stem is damaged in the gland range, replace the entire stem-plug-unit.

Contact your local office or branch.

Before disposal the valve must be dismantled and separated into its various constituent materials.

Legislation may demand special handling of certain components, or it may be sensible from a ecological point of view.

Current local legislation must be observed.

Warranty

The technical data given for these applications is valid only in conjunction with the

Siemens actuators as detailed under «Equipment combinations», page 3.

All terms of the warranty will be invalidated by the use of actuators from other manufacturers.

Siemens

Building Technologies

3-port seat valves, external thread, PN 16

7/10

CE1N4463en

15.11.2010

Technical data

Functional data PN class

Operating pressure

PN 16 to ISO 7268 to ISO 7005 within the permissible medium temperature range according to the diagram on

page 6

 Throughport

0…30 %

 Throughport

30…100 %

 Bypass

0…100%

 linear

 equal percentage; n gl

= 3 to VDI / VDE 2173

 linear vs

value to DIN EN 1349

 Bypass standard version 0.5…2% of k vs

value

 Bypass VXG41..01

0…0.02% of k vs

value

Permissible media water cooling water, chilled water, low temperature hot water, high temperature hot water, water with anti-freeze; recommendation: water treatment to VDI 2035 drinking water VXG41..01, < 90 °C

Medium -25...150 °C

DVGW applications, VXG41..01, chilled- and low temperature hot water max. 90 °C

Rangeability > 50

DN ≥20: >100

Nominal stroke 20 mm

Industry standards Pressure Equipment Directive

Pressure Accessories

Fluid group 2

DVGW approval No.

Environmental compatibility

PED 97/23/EC as per article 1, section 2.1.4 without CE-marking as per article 3, section 3

(sound engineering practice)

DW-6341BU0025

ISO 14001 (Environment)

ISO 9001 (Quality)

SN 36350 (Environmentally compatible products)

RL 2002/95/EG (RoHS) bronze CuSn5Zn5Pb2 stainless steel

Materials

Dimensions / Weight

Valve body

Seat, plug, stem

Sealing gland gland materials

Refer to «Dimensions»

External thread connections dezincification-free brass, silicon-free

EPDM O rings, silicon-free

G..B to ISO 228-1

1)

Media below 0 °C: Stem heating element required to prevent freezing of the valve stem in the sealing gland.

With ALG..B fittings for media temperature up to 100 °C

Applications requiring union fittings with DVGW approval must be delivered by thirds.

8/10

Siemens

Building Technologies

3-port seat valves, external thread, PN 16 CE1N4463en

15.11.2010

Dimensions

B

DN = Nominal size

H = Total actuator height plus minimum distance to the wall or the ceiling for mounting, connection, operation, service, etc.

H1 = Dimension from the pipe centre to install the actuator (upper edge)

H2 = Valve in the «Closed» position means that the stem is fully extended

L2

Type

VXG41.1301

L1

DN B

[mm]

G

[inch]

L1

[mm]

L2

[mm]

L3

[mm]

H1

[mm]

H2

[mm]

H

SAX.. SKD.. SKB.. [kg]

VXG41.1401

VXG41.15 VXG41.1501

15 G1B

10 122.5 > 526 > 601

VXG41.20 VXG41.2001 20 G1¼B

VXG41.25 VXG41.2501 25 G1½B

VXG41.32 VXG41.3201 32

14

G2B

105 52.5 52.5 34 130.5

> 534 > 609

kg

1.30

1.42

1.65

2.10

VXG41.40 VXG41.4001 40 15 G2¼B 130 65 65

VXG41.50 VXG41.5001 50 16 G2¾B 150 75 75

Threaded fittings

Type / Stock No. Type

46 142.5

> 546 > 621

2.80

3.90

Stock No. for valve type G Rp

[inch] [inch]

S55846-Z101

Rp ½

G 1¼ Rp ¾

G 1½ Rp 1

G 2 Rp 1¼

G 2¼ Rp 1½

G 2¾ Rp 2

 On valve side: cylindrical thread to ISO 228-1

 On pipe side: with cylindrical thread to ISO 7-1

 For drinking water applications according to DVGW drinking water regulation 2001 threaded fittings must be obtained from local dealer.

 ALG..B for media temperatures up to 100 °C

 Applications requiring union fittings with DVGW approval must be delivered by thirds.

Siemens

Building Technologies

3-port seat valves, external thread, PN 16

9/10

CE1N4463en

15.11.2010

Spare parts

Revision numbers

Order numbers for spare parts

Sealing gland

Type

VXG41.1301

VXG41.1401

VXG41.15

VXG41.1501

VXG41.20

VXG41.2001

VXG41.25

VXG41.2501

VXG41.32

VXG41.3201

VXG41.40

VXG41.4001

VXG41.50

VXG41.5001

25

25

32

32

40

15

15

15

15

20

20

40

50

50

DN

74 284 0047 0

74 284 0047 0

4 284 8874 0

74 284 0047 0

4 284 8874 0

74 284 0047 0

4 284 8874 0

74 284 0047 0

4 284 8874 0

74 284 0047 0

4 284 8874 0

74 284 0047 0

4 284 8874 0

74 284 0047 0

Set

Plug with stem, circlip, sealing

74 676 0166 0

74 676 0167 0

74 676 0135 0

74 676 0137 0

74 676 0121 0

74 676 0126 0

74 676 0122 0

74 676 0127 0

74 676 0123 0

74 676 0128 0

74 676 0124 0

74 676 0129 0

74 676 0125 0

74 676 0130 0

Type

VXG41.1301

VXG41.1401

VXG41.15

VXG41.1501

VXG41.20

Valid from rev. no.

..B

..B

..A

..B

..A

Type Valid from rev. no.

Type Valid from rev. no.

VXG41.2001

..B

VXG41.25

..A

VXG41.2501

..B

VXG41.32

..A

VXG41.40

VXG41.4001

VXG41.50

VXG41.5001

..A

..B

..A

..B

VXG41.3201

..B

10/10

Siemens

Building Technologies

© 1998 - 2010 Siemens Switzerland Ltd

3-port seat valves, external thread, PN 16

Subject to alteration

CE1N4463en

15.11.2010